Chygrynets, V. P., V. A. Ihnatenko, and P. B. Tarnopilsky. “FOREST TYPOLOGY STRUCTURE AND PRODUCTIVITY OF PEDUNCULATE OAK FOREST STANDS OF DIFFERENT ORIGIN IN THE SUMY REGION”. Forestry and Forest Melioration, no. 126, Feb. 2018, pp. 122-31, http://forestry-forestmelioration.org.ua/index.php/journal/article/view/188.